#include <iostream>
#include <cctype>

using namespace std;

class Solution
{
public:
    bool isNumber(const char *s) 
	{
        // Start typing your C/C++ solution below
        // DO NOT write int main() function
		if(!s)
			return false;
		
        while(*s==' ')
			s++;

		bool dot = false;
		if(*s!='+' && *s!='-' && !isdigit(*s) && *s!='.')
			return false;


    }
};

int main()
{
	return 0;
}
